Method and apparatus for coating perforated webs.



I. B. THOMPSON.

METHOD AND APPARATUS FOR COATING PERFORATED WEBS.

APPLIOATIOK FILED AUG. 30, 1909.

960,437, I Patented June 7, 1910 3 SHEETS-SHEET 1.

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METHOD AND APPARATUS FOR COATING PERFORATBD WEBS.

APPLICATION FILED AUG. 30, 1909.

Patented June 7, 1910.

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I. B. THOMPSON. mmnon AND APPARATUS FOR comma PERFORMED WEBS.

APPLICATION FILED AUG; 30, 1909.

Patented June 7,1910,

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drawings, forming a part side of the Support.

the character of the terial which 4.5 perforated rnnnnrox B.

THOMPSON, OF CHICAGO, ILLINOIS, ASSIG-NOR 'IO NATIONAL WATER- PROOF FILM. COMPANY, A CORPOBA'IION- OF ILLINOIS.

METHOD AND APPARATUS FOR COATING PERFORATED WEBS.

Application filed August a To all whom it may concern:

Be it known that I, FREDRIOK B. THOMP- SON, a citizen of the United States, and resident of Chicago, county of Cook, and State have invented certain new and useful Improvements in Methods and Aparatus for Coating Perforated Webs, of which the following is a specification, and

. which are illustrated in thereof.

The invention relates to the coating of flexible perforated webs, particularly those carrying photogriqmic images and employed for the projection of pictures representing 15 motion. TheseEpicture-carrying webs commonly com r1se a ,fle1gbletranspargt gup;

emulsion of gelatin in which the photographic images are formed applied to one For advancing the web through the machine employed for the projection of the photographic images which it carries, the web has along each of its marins a row of perforations adapted to inter-' 25 mesh with the sprocket teeth of the feeding mechanism of the machine. In use, the faces of these webs become scratched, and these scratches are particularly deleterious when they become filledwith dirt, although photographic pellicle constituting one face of the web will not permit of their being cleansed by washing. ..To this end it has been proposed to cover the photographic pellicle with a coating mais unaflected by' moisture, and which thereby renders the web waterproof. A material which may conveniently be employed for this coating is a solution of pyroxylin in amyl acetate softened by the addition of small quantities of glycerin or .castor oil.

The object of the invention is toprovide for the application of such a coating material as that just mentioned to the face of a web without closing or bridging over the perforations of the web. I

The invention contemplates the applicationcof a primary or sizing coating of the material to the entire face of the meb, this coating being too thin'to maintain itself in the web, and material the a film over the perforations of a second application of the coating to that part of the web located between marginal rows of perforations while thematerial first applied is still fluid, the mathe accompanying Specification of Letters IEatent.

Patented June a, .1910.

o, 1909. Serial No. 515,202.

terial last applied being sufficient in quantity to flow and unite with that first applied over the entire face of the web.

The invention further contemplates a form of apparatus which may be employed for applying the coating material in the manner ust indicated, and which may be conveniently arranged as illustrated in the accompanying drawings, wherein,

,-Figure 1 shows the apparatus in side elevation; Fig. 2 is an end elevation of the same; Fig. 3 is a sectional detailtaken on the line 3-3 of Fig. 1; Fig. 4 is a partial plan view of the apparatus; Fig. 5 is a detail plan sectional view taken on the line 5-;5 g

of Fig. l ga ndEigkmslfows inmideclevatioh ""2; detail 'of webbing such as may be coated in practicing the invention.

The apparatus contemplated by the invention preferably comprises a liquid-applying roller, such as that designated by the numeral 10 in the drawings, and a liquid-applying brush 11, adapted to engage the face of the web X in succession. The marginal rows of sprocket apertures of the web are shown at m in Fig. 6 of the drawings, and while the liquid-applying roller 10 is preferably substantially equal in width to the entire width of the web X, as most clearly shown in Fig. 4, the liquid-applying brush 11 is narrower, its width being substantially equal to the width of that part of the web located between the marginal rows of sprocket apertures 00,

in Fig. 3.

The liquid-applying roller 10 and brush 11 are conveniently supported in a frame generally designated by the numeral 13, and comprising side members. 14, 15 connected at intervals by tie rods, as 16, Fi 1. As shown,'the brush 11 is of be rotated and is provided in duplicate, thesebrushes and the roller 10 each havin a spindle 17 which is removably suppo'rte for rotation in the frame 13 by havlng its ends engage, respectively, with the point of a set screw 18 mounted in the side frame member 15 and the poi t of a spring plunger 19 mounted in the frame member 14. 4

For supporting the web X in front of the This guide roller turns upon a spindle 21 having its ends supported in arms 22, 23 of the frame 13 and carrying at each side of the l roller 20 a disk having a flange 25 which as most clearly shown I a form a apted to 45 ththe' coating material from a servesfor guiding the web. The web is treated progressively from end to end by being drawn through the apparatus as by being delivered from a reel A and having one of its ends secured to a moving tape B. The face of the web engages with the liquid- 1 applyingroller through having the Web turned over this roller asa guide, and en-v gages with the brushes 11 as the web turns over the guide roller 20.

The liquid-applying roller 10 is prefer- ",ably turned by "the advance of the web.

' spindles and intermeshin To this end guide rollers 26, 27 are journaled in the frame 13 in front of the'roller 10, and one of these guide rollers, as-26, has sprocket teeth 28 for engaging the marginal perforations a: of the web X, and has gear iconnection-29, 30 with the spindle ofthe roller 10.

The brushes 11. are preferably turned by power-other than the advance of the web. To this end a driving shaft 31 extends transversely through the frame 13 below the brushes 11 and intermediate their spindles 17, with each of which it has gear connection, as by a driving gear 32 mounted" on the shaft, and gears 33, 34 mounted upon the with thegear 32.

The liquid-appl 'ro er 10is supplied with c oating materia from. a pan 35 supported in the frame 13,and into'which the 'roller dips. Means are provided for regulating the quantity of coating material .car-

ried out of the pan 35 by the roller 10. For

.'''this wiper takes the form of a vane carried ithls' p ose a wiper 36 is adjustably mounted in firont of the roller. As shown,

-- by ashaft 37. This shaft is journaled at its ends in the side 'membersof the frame 13 and is turned for sw' the vane toward and away from the roller 10'by means of I a worm-shaft- '38 'journaled in the frame .member 14 and eng' gmg'a worm wheel 39 mounted on'the shaft'37. -,-The liquid-*applying' brushes 11 are suppan , 40 mcunted in the frame 13 through rollers I 41, 42 which, dip into the S5 Y regulating-the quantityof coatan and engage the-brushes. As shown,' t

journaled in arms 43, 44 of the frame and are turned fiom jthe dri shaft 31,'by meansof gears 45, 46 mounted, respectively, upon the' spindles of the rollers and engaging .the gear 32. Wipers 48, 49, similar in construction to the 4 wiper 36,. are

material carried to the brushesill by t e rollers A uniform uantity of the coatingmaterbalbmay be maintained in the pans 35 and .4 y

and 51 mounted, res ively, in brackets 52 and 53. omthe; fraine 13 and ee pipes 54, 55 which enter the rom which it is formed. As the without closing ese rollers are provided for.

means ofsiph on feeding bottles 50 In using the apparatus, the web X will be moved continuously by the movement of the tape B. The brushes l1 and rollers 41, 42

will ,be'turned continuously by power ap plied to the shaft 31. The gear connection 29, 30 between the guide roller 26 and the liquid-applving-roller 10 is preferably such that the surface speed of the liquid-applying roller will be identical with that of the web X. By a proper adjustment of the wiper 36, a very thin coating of material may be applied to the entire face of the web X. Such a coating will not permanently bridge over the perforations m of the web, as the surface tension of.the film of material placed in front of each perforation durin the movement of the llquid-applying r0 ler will be eater than the cohesion of the particles brushes 11 are insufiicient in'width' to cover the perforations a: of the web, considerable quantities of the coating material may be a plied by means of these brushes without 0 osing the perforations. The entire surface of the film being, however, already moistened with the coating material from'the roller 10, that applied by the brushes'will um'tefwith that applied-by the-.rolle1", and av substantially uniform coating will thus be applied to the entire surface of the web. I' claim as my inventionv 1. Themethod of coating the face of a Web having marginal rows of perforations the perforations with the coating material, which consists in first spreadlng upon the entire face of the web a film of coating material in the fluid state, the said film being of such thickness that the 1n combinatlon, a li uid-applymg tool substantially equal in wldth to the entire width of theweb, and a liquid-applying tool substantially equal in width to that part of the web between the rows of perforations, arranged to operate successively.

3. In an apparatus for coating the face of a web havin mar al' rows of perforations,

the material first applied is in combination, a 'quid-applying rollersuby qual in width to the entire width 'of the web, and a liquid-applying brush substantially equal in width to that part of the web between the rows 'of perforations, arranged toengage the face of the web in 811006881011.

4. In an" apparatus fo qaoating the face a web having marginal rowsof perforations,

stanti ally equal of a web having marginal rows of perforations, in combination, a liquid-applymg roller substantially e ual in width to the entire width of the we means for regnlating the quantity of liquid delivered by the roller, and a liquid-applying brush substantially equal in width to that part of the web between the rows of perforations, arranged to engage the face of the web in succession.

5. In an apparatus for coating the face of in combination, a liquid-applying roller subin width to the entire Width of the web, a liquid-applying brush substantially equal in width to that part of the web between the rows of perforations, arranged to engage the face of-the web in succession, and means for regulating the quantity of that part of liquid delivered by the roller and by the brush.

I FREDRICK B. THOMPSON! Witnesses:

( CHARLES B. GILLsoN, E. M. KLATCHER. 

